<template>
  <div>
    <!-- 面包屑区域 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格 -->
      <el-table
        :data="cateList"
        style="width: 100%;margin-bottom: 20px;"
        border
        :tree-props="{children: 'children'}"
        row-key="cat_id"
        stripe
      >
        <el-table-column type="index" label="#" width="62"></el-table-column>
        <el-table-column prop="cat_name" label="分类名称" sortable width="395"></el-table-column>
        <el-table-column label="是否有效" sortable width="390">
          <template v-slot="scope">
            <i
              class="el-icon-success"
              style="color:lightgreen"
              v-if="scope.row.cat_deleted ===false"
            ></i>
            <i class="el-icon-error" style="color:red" v-else></i>
          </template>
        </el-table-column>
        <!-- 排序 -->
        <el-table-column label="排序" sortable width="395">
          <template v-slot="scope">
            <el-tag v-if="scope.row.cat_level===0">一级</el-tag>
            <el-tag type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
            <el-tag type="warning" v-else>三级</el-tag>
          </template>
        </el-table-column>
        <!-- 操作 -->
        <el-table-column label="操作" sortable width="395">
          <template v-slot="scope">
            <el-button
              type="primary"
              icon="el-icon-edit"
              @click="showCateDialog(scope.row.cat_id)"
            >编辑</el-button>
            <el-button type="danger" icon="el-icon-delete">删除</el-button>
          </template>
        </el-table-column>
      </el-table>

      <!-- 分页区 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <!-- 添加分类的表单 -->
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <!-- options指定数据源 -->
        <!-- :props用来指定配置对象 -->
        <el-form-item label="父级分类：">
          <el-cascader
            v-model="seletcKey"
            :options="parentCateList"
            :props="cascaderProps"
            @change="parentCateChanged"
            clearable
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改商品分类的对话框 -->
    <el-dialog title="修改分类" :visible.sync="cateDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editCateForm" :rules="cateListRules" ref="cateFormRef" label-width="100px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editCateForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="cateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCateInfo">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      //商品分类的数据列表，默认为空
      cateList: [],
      //总数据条
      total: 0,
      //控制添加分类对话框的显示与隐藏
      addCateDialogVisible: false,
      // 添加分类表单数据对象
      addCateForm: {
        //将要添加分类的名称
        cat_name: '',
        //父级id
        cat_pid: 0,
        //分类的等级默认为1级分类
        cat_level: 0,
      },
      //添加表单的验证规则
      addCateFormRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' },
        ],
      },
      //父级分类的列表
      parentCateList: [],
      //指定级联选择器对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover',
        checkStrictly: 'true',
      },
      //选中的父级分类的id数组
      seletcKey: [],
      //修改分类对话框显示于隐藏
      cateDialogVisible: false,
      // 查询分类信息
      editCateForm: {},
      //修改分类名字规则
      cateListRules: {
        cat_name: [
          { required: true, message: '请输入分类名称', trigger: 'blur' },
        ],
      },
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    //获取商品列表数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo,
      })
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      console.log(res.data)

      //把数据列表赋值给cateList
      this.cateList = res.data.result
      //为总数据条赋值
      this.total = res.data.total
    },
    // 监听pagesize改变
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    //展示添加分类的对话框
    showAddCateDialog() {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    //获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 },
      })
      console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类失败！')
      }
      this.parentCateList = res.data
    },
    //选择项发生变化触发这个函数
    parentCateChanged() {
      // 如果selectKeys数组中的length大于0，证明选中的父级分类
      // 反之，说明没有选中任何父级分类
      if (this.seletcKey.length > 0) {
        // 父级分类的id
        this.addCateForm.cat_pid = this.seletcKey[this.seletcKey.length - 1]
        // 为当前分类等级赋值
        this.addCateForm.cat_level = this.seletcKey.length
      } else {
        // 父级分类的id
        this.addCateForm.cat_pid = 0
        // 为当前分类等级赋值
        this.addCateForm.cat_level = 0
      }
    },
    // 点击按钮添加分类
    addCate() {
      this.$refs.addCateFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          'categories',
          this.addCateForm
        )
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败!')
        }
        this.$message.success('添加分类成功！')
        this.addCateDialogVisible = false
        this.getCateList()
      })
    },
    //监听对话框的关闭事件，重置表单数组
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.seletcKey = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
    //展示编辑分类的对话框
    async showCateDialog(id) {
      //查询分类的名称
      const { data: res } = await this.$http.get('categories/' + id)
      if (res.meta.status !== 200) {
        return this.$message.error('查询分类失败')
      }
      this.editCateForm = res.data
      this.cateDialogVisible = true
    },

    //修改分类信息并提交
    editCateInfo() {
      this.$refs.cateFormRef.validate(async (valid) => {
        if (!valid) return
        const { data: res } = await this.$http.put(
          'categories/' + this.editCateForm.cat_id,
          {
            cat_name: this.editCateForm.cat_name,
          }
        )
        console.log(res)
        if (res.meta.status !== 200) {
          return this.$message.error('更新分类信息失败！')
        }
        //关闭对话框
        this.editDialogVisible = false
        //刷新分类列表
        this.getCateList()
        //关闭对话框
        this.cateDialogVisible = false
        //提示修改成功
        this.$message.success('更新分类信息成功！')
      })
    },
    //监听修改分类对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields()
      this.editCateForm = ''
    },
  },
}
</script>

<style lang="less" scoped>
.el-cascader {
  width: 100%;
}
</style>